Find the number of primitive roots of G=?(a) 5(b) 6(c) 4(d) 10This question was posed to me in a national level competition.This interesting question is from Number Theory topic in chapter More Number Theory of Cryptograph & Network Security

Find the number of primitive roots of G=?(a) 5(b) 6(c) 4(d) 10This que

1.	Find the number of primitive roots of G=?(a) 5(b) 6(c) 4(d) 10This question was posed to me in a national level competition.This interesting question is from Number Theory topic in chapter More Number Theory of Cryptograph & Network Security
Answer» The correct choice is (c) 4 Easy explanation: Number of primitive ROOTS = f(f(11))=f((111-110)) = f(10)= f(2). f(5) = (21-20)(51-50) = 1 x 4 = 4 The primitive roots of this set {2, 6, 7, 8}.

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